Safety attachment for elevators



(No Model.)

B. J. MORRISON.

V SAFETY ATTACHMENT FOR BLEVATOM.

Patented Apr. 4

YATES A'rnN'r un on.

SAFETY ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 494,933, dated April 4,1893.

Application filed August 12, 1892. Serial No. 442.891. (No model.)

To all whom, it may concern:

Be it known that 1, ROBERT J. MORRISON, of the city of St. Louis,in theState of Missouri, have invented a certain new and useful Improvement inSafety Attachments for Elevators, of which the following is a full,clear, and

' exact description, reference being bad to the accompanying drawings,forming part of this specification.

My invention relates to a simple, cheap, durable and efiectiveattachment for elevators, by which the descent of the cage can begradually stopped and held in case of breakage of the hoisting rope, orin case of the hoisting machinery getting out of order.

Myinvention consists in features of novelty hereinafter full y describedand pointed out in the claim.

Figure I is atransverse section through the cage and uprights or guideposts of an elevator; my attachment being shown in top or plan view. Thesection is taken on line I-I,

Fig. II. Fig. II is a detail, side elevation,

showing parts of theuprightsor posts removed. Fig. III is a detail view.

Referring to the drawings, 1 represents the cage of a passenger or otherelevator.

2 represents the uprights or posts which guide the elevator in itsupward and downward movement. These uprights or posts I prefer to makeof I beams or bars, as shown in Fig. I, so that they will present astrong, unyielding surface against lateral strain.

3 are the brackets which guide the cage on the uprights or posts.

4 represents the usual notched vertical bars secured to the uprights orposts, and which may be utilized, if desired, to workin connec tion withthe usual automatic check, if it is desired to apply such a check.

6, 6* are side pendent boxes, 6" is an intermediate pendent box locatedbetween the side boxes, and 6 is a short pendent box located between theintermediate box and one of the side boxes and all secured to the bottomof the cage. Adapted to slide in the boxes 6 and 6 is a short lower bar5 formed with a forked or bifurcated head 10, and a rack 12 on its upperside.

5 is a long upperbar bent and formed with a forked or bifurcated head10, in line with the head of the lower bar, and a rack 13 on its underside, located over the rack on the lower bar, and adapted to slide inthe boxes 6, 6", and 6.

7 represents a rock-shat t jou rnaled in boxes 7 a secured to the cage,and which isprovided with a pinion 8 located between and engaging thecogs or teeth of the racks or bars 5 5, one rack being beneath thepinion and the other above the pinion, so that when the shaft 7 isturned, the racks will be moved in opposite directions, each away fromthe center of the cage; and when the shaft is turned back, the rackswill be both moved inwardly, or retractcd.

9 represents a lever secured to the shaft 7 for rocking it, and movingthe racks. The outer end of each bar which is forked or bifurcated,straddles the notched bars 4. The outer ends or surfaces 11 of each head10 10 are adapted to bear against the uprights or guide posts 2, whenthe bars are moved outwardly as described, thus producing a frictionalcontact between the heads of the bars and the uprights to check the cageand stop its descent in case of accident.

The operation is simply that of taking hold of the lever 9, and, byrocking the shaft 7, moving the bars 5 outwardly to press the bearingsurfaces 11 of their heads 10 10 against the flat surface of theuprights, and, by making the uprights of I beams or bars, as stated,

and as shown in the drawings, a very rigid resistance is provided forthe heads of the bars to press against. It will be seen that, by the useof a frictional device of this kind, the descentof the cage willbechecked and stopped gradually, and with practically no danger ofbreakage of the parts as would be the case were a.positive stop used,such, for instance, as having the bars engage positively with thenotches of the bars 4..

I claim as my invention The combination, with a cage, andthe uprights bywhich the cage is guided; of the pendent side boxes 6, 6, the pendentintermediate box 6 and the pendent short box 6 secured to the bottom ofthe cage, the short lower bar 5 sliding in the intermediate box and inone of the side boxes and having a forked head 10 adapted to bcaron theupright adjacent thereto, and a rack 12 on its upper bearings, thepinion 8, located between the side, the bent long upper bar 5 sliding inthe racks and secured to the rock-shaft, and the 10 other side box andin the short box, and havlever 9 secured to the rock-shaft, by which theing a forked head 10", adapted to bear on the device is operated;substantially as described.

upright adjacent thereto, and track 13 on its ROBERT J. MORRISON. underside located over the rack on the lower In presence ofbar, the bearings7 secured to the bottom of ALBERT M. EBERSOLE,

the cage, the rock-shaft 7 mounted in said ED. S. KNIGHT.

